Pascaline

Retirement & International Suite

Form 8606 / Backdoor Roth beta

Nondeductible IRA basis, the pro-rata rule, backdoor and mega-backdoor Roth analysis, and the conversion-optimization decision.

Get an API key Docs

Endpoints

  • POST /ira/form-8606

MCP tools

  • calculate_ira_basis_and_conversion
  • analyze_backdoor_roth

Example

curl -X POST https://pascaline.io/ira/form-8606 \
  -H 'content-type: application/json' \
  -H 'x-api-key: <keyId>.<secret>' \
  -d '{ ... }'

Responses include data_as_of, formula_version (2026.1), citations, and tier (beta). See the full reference and the verification process.

Form 8606 calculator API · backdoor Roth pro rata API · IRA basis calculator